1. Department of Histology and Embryology, Giresun University, Faculty of Medicine, Giresun, Turkey;
2. Department of Histology and Embryology, Ondokuz Mayıs University, Faculty of Medicine, Samsun, Turkey;
3. Stereology and Electron Microscopy Laboratory, Aarhus University Hospital, Aarhus, Denmark;
4. Department of Public Health, Black Sea Technical University, Faculty of Medicine, Trabzon, Turkey;
5. Department of Statistic, Faculty of Fine and Art, Ondokuz Mayıs University, Samsun, Turkey